
Wah
Not Literal
When 'wah' is used to mimic complaining, it's exaggerating for effect and not usually a real cry. 
Tone Matters
The tone when pronouncing 'wah' can convey different levels of complaining, from light teasing to annoyance. 
Informal Use
'Wah' is informal and often used with friends or in casual settings, not formal situations. 